f(-1)=3(-1)-7

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Solution for f(-1)=3(-1)-7 equation: 



f(-1)=3(-1)-7

We move all terms to the left:

f(-1)-(3(-1)-7)=0

We add all the numbers together, and all the variables

f(-1)+10=0

We multiply parentheses

-1f+10=0

We move all terms containing f to the left, all other terms to the right

-f=-10

f=-10/-1

f=+10

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